Originally Posted by cherokeesam
Killian, by a long shot.
Killian is the only decent villain to go toe to toe with Iron Man, to be an actual supervillain instead of a Guy In A Suit, to actually insinuate himself into Tony's life over a long period of time, to conceive a brilliant subterfuge that deceived not only Tony but the world, and to have aspirations toward supervillainy that all the others severely lacked.
I'm not sure you and I watched the same IM3 and GL. The only accurate descriptor you have of Killian is "nerdy nobody." Killian was neither slimy, ugly, nor weasely. He was nerdy in 1999, and crippled, but there was nothing there to insinuate that he was slimy or ugly, or even a bad guy. In fact, you can't help but feel sorry for that guy. And then what he turned into was a suave, sophisticated, brilliant and thoroughly vicious supervillain; not a psionic monster with a giant head.
Okay... fine I'll retract that. But he remains where he is on my list.
I've also heard the comparison to Edward Nigma from Batman Forever.
Also this is relevant: "For comparison, the Mandarin has appeared in 181 Marvel comics since his creation (Source: Marvel Wikia). Killian has appeared in ... 1 page of 1 issue. Killian's personality was stolen from the Mandarin."
Just disappointing to many.